The left ventricle, to create the highest pressure, to send blood all around the body.

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Why do the Atria have Thin Walls?

They only need to push blood into the ventricles

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Name the Vessel that Carries Blood into the Left Atrium.

Pulmonary Vein

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Name the Vessel that Carries Blood out to the Body.

Aorta

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Name the Vessel that Carries Blood out to the Lungs.

Pulmonary Artery

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Name the Vessel that Carries Blood into the Right Atrium.

Vena Cava

20 of 37

What Contracts First the Atria or the Ventricles?

The Atria

21 of 37

Describe the Cycle of Events in One Heartbeat.

All chambers relax as blood flows into the heart: the pacemaker produces an electrical stimulus; The atria contract pushing blood into the ventricles; the ventricles contract pushing the blood out of the heart into the main arteries.

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What is the Role of the Valves Between the Ventricles and the Arteries?

These valves prevent blood from flowing up the ventricles to the arteries as the ventricles relax.

23 of 37

Explain Why Veins Need Valves.

The veins have a very low pressure and valves prevent back flow of blood away from the heart the veins in the arms and legs.

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Where in the Body are Capillaries Found?

In all the organs between the arteries and veins.

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What is the Role of Capillaries?

They are exchange surfaces.

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Why are there such a Large Number of Capillaries?

To provide a large surface area for exchange.

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Name the Vessel that Brings Blood to a Capillary Bed.

Artery

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Name the Vessel Found at the Other End of the Capillary Bed.

Vein

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Explain Why Blood Pressure Drops in the Capillaries.

Blood fluid is squeezed out of the capillary to become tissue fluid. The volume of blood therefore decreases, which reduces the pressure.

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List 3 Properties of Capillaries that Help Make Exchange Efficient.

Small Diameter, Very Thin Wall, Large Numbers

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Name 3 Components of Blood that do not Leave the Capillaries.

Red Blood Cells, Platelets, Large Proteins

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Name 3 Substances in Plasma that Pass Out of the Capillary.

Water, Oxygen, Nutrients (Amino Acids)

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At Which End of the Capillary do Substances Leave the Blood?

The Arterial End

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Name 2 Substances that Pass Back into the Capillary.

Carbon Dioxide, Water

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At Which End of the Capillary do Substances Re-Enter the Blood?

The Venous End

36 of 37

Explain the Role of Tissue Fluid in Supplying Cells.

The tissue fluid surrounds the body cells bathing them in oxygen and nutrients. The oxygen and nutrients can diffuse from fluid through cell membranes.

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Card 5

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Comments

An easy to understand set of cards that cover the key facts of the circulatory system that would be useful to any GCSE science or biology students needing to study this topic.Team these up with some notes that contain images so that you can learn where the structures and vessels are placed on a diagram.